: In the same Compatibility tab, check the box for "Disable full-screen optimizations" to prevent Windows overlays from causing freezes.

Check out this quick visual guide on setting administrative permissions and basic compatibility fixes: How To Fix League Of Legends Not Opening - NEW 2026⚠️ YouTube• Jul 2, 2025 2. Fixing "Critical Error" & Client Freezes

: Open the Riot Client , click your profile icon, go to Settings , select League of Legends, and click Repair . This checks for and fixes missing or corrupted game files. 3. Improving FPS & Reducing Lag

: Navigate to your LoL installation folder (usually C:\Riot Games\League of Legends ). Locate and delete the Config and Data folders. The game will automatically reinstall fresh versions of these files when you relaunch.

This report covers essential troubleshooting steps for (LoL) errors, including crashing, freezing, and performance issues like FPS drops, based on the latest 2026 support guides. 1. Essential First Steps

Performance drops are often tied to hardware bottlenecks or outdated software.